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c5b3fe2094
Certain functions require the `returns_twice` attribute in order to produce correct codegen. However, `-fno-builtin` removes all knowledge of functions that require this attribute, so this PR modifies Clang to add the `returns_twice` attribute even if `-fno-builtin` is set. This behavior is also consistent with what GCC does. It's not (easily) possible to get the builtin information from `Builtins.td` because `-fno-builtin` causes Clang to never initialize any builtins, so functions never get tokenized as functions/builtins that require `returns_twice`. Therefore, the most straightforward solution is to explicitly hard code the function names that require `returns_twice`. Fixes #122840
60 lines
1.6 KiB
C
60 lines
1.6 KiB
C
// RUN: %clang_cc1 -x c %s -triple x86_64-linux-gnu -emit-llvm -o - | FileCheck %s
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// RUN: %clang_cc1 -x c %s -triple x86_64-linux-gnu -emit-llvm -fno-builtin -o - | FileCheck %s
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// RUN: %clang_cc1 -x c++ %s -triple x86_64-linux-gnu -emit-llvm -o - | FileCheck %s
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct __jmp_buf_tag { int n; };
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struct __ucontext_t_tag { int n; };
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int setjmp(struct __jmp_buf_tag*);
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int sigsetjmp(struct __jmp_buf_tag*, int);
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int _setjmp(struct __jmp_buf_tag*);
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int __sigsetjmp(struct __jmp_buf_tag*, int);
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int _setjmpex(struct __jmp_buf_tag* env);
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int getcontext(struct __ucontext_t_tag*);
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typedef struct __jmp_buf_tag jmp_buf[1];
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typedef struct __jmp_buf_tag sigjmp_buf[1];
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typedef struct __ucontext_t_tag ucontext_t[1];
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#ifdef __cplusplus
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}
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#endif
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void f(void) {
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jmp_buf jb;
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ucontext_t ut;
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// CHECK: call {{.*}}@setjmp(
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setjmp(jb);
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// CHECK: call {{.*}}@sigsetjmp(
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sigsetjmp(jb, 0);
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// CHECK: call {{.*}}@_setjmp(
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_setjmp(jb);
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// CHECK: call {{.*}}@__sigsetjmp(
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__sigsetjmp(jb, 0);
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// CHECK: call {{.*}}@_setjmpex(
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_setjmpex(jb);
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// CHECK: call {{.*}}@getcontext(
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getcontext(ut);
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}
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// CHECK: ; Function Attrs: returns_twice
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// CHECK-NEXT: declare {{.*}} @setjmp(
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// CHECK: ; Function Attrs: returns_twice
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// CHECK-NEXT: declare {{.*}} @sigsetjmp(
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// CHECK: ; Function Attrs: returns_twice
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// CHECK-NEXT: declare {{.*}} @_setjmp(
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// CHECK: ; Function Attrs: returns_twice
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// CHECK-NEXT: declare {{.*}} @__sigsetjmp(
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// CHECK: ; Function Attrs: returns_twice
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// CHECK-NEXT: declare {{.*}} @_setjmpex(
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// CHECK: ; Function Attrs: returns_twice
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// CHECK-NEXT: declare {{.*}} @getcontext(
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